3M
™ Multi-Touch ASIC Controller Reference Guide
9
3M Touch Systems, Inc. Proprietary Information
•
The Dual-Mode controller requires separate 5V input and is self-powered. It can
operate either as a USB or Serial RS-232 input controller. If both USB and serial are
connected, the default is USB. Otherwise the controller will use whichever USB or
serial input is connected.
Handling and ESD Protection
When mounting the sensor and controller, use normal precautions for handling
electrostatic sensitive devices. The 3M Multi-Touch Controller
PX5nnn
has internal
protection to ±4KV for ESD discharges to the controller or touch sensor surface that may
occur during normal assembly operations.
Establishing the Data Connection
USB Connection
In USB mode, the controller uses a 3M Touch Systems USB communication cable (P/N
7319420) PC 99 compatible or equivalent interconnects. One end of this cable plugs into
the USB connector on the PX5000 series controller. The other end has a Type-A
connector, and plugs into a USB port on your PC.
When creating a custom cable, use the components found in Table 4 (Page 11). The
following table describes the interconnections of the 3M Touch Systems USB cable.
Table 2. USB Cable for
3M™ Multi-Touch Controllers PX5000 Series
PC Side (USB Type A)
Wire
Controller Side (5-Pin Molex)
Pin
USB Assigned
Color
Pin
Description
1
+5Vdc (VBUS)
Red
1
+5Vdc VBUS power
2
Data (DN)
Gray
2
Data (DN) differential pair
3
Data (DP)
Green
3
Data (DP) differential pair
4
0V
Black
4
Power return
5
Cable Shield Shell
Charcoal
Gray
5
Outer cable shield around signal and
power lines. Chassis (earth) ground
Serial Connection
For serial mode, the PX5nnn series controller uses a 3M Touch Systems RS-232 plug and
play cable (P/N 7319630) or an equivalent interconnects.
One end of this cable plugs into the RS-232 connector on the PX5000 series controller.
The other end, which has a 9-pin D connector, can plug directly into a serial port on your
PC extender card. The following table describes the interconnections for the 3M Touch
Systems RS-232 cable.
When creating a custom cable, use the components found in Table 4 (Page 11). The
following table describes the interconnections of the 3M Touch Systems serial cable.
